kafkaProducerVirtualThread

By default, Tomcat in Spring Boot has a thread pool consisting of a maximum of 200 threads.

It means that If your web application simultaneously receives more than 200 HTTP requests, then some of them will be put in a queue waiting for available threads.

MISURATORE RISORSE MACCHINE

SPRING actuator ( performace)

http://localhost:8081/actuator

STEP PROPEDEUTICI

creare nodo kafka/zookeeper

cd docker/docker-kafka

docker-compose up -d

creare nodo zipkin / elasticsearch / kibana

cd docker/zipkin-elastic-kibana $ docker-compose up -d

check status elasticsearch

visualizza indici presenti in elasicsearch http://localhost:9200/_cat/indices?v&pretty

ZIPKIN monitora le richieste HTTP

console web http://localhost:9411

KIBANA

console http://localhost:5601/

GUIDA ALL'INTEGRAZIONE ZIPKIN / ELASTICKSEARCH / KIBANA (https://logz.io/blog/zipkin-elk/)

STEP

inviare una richiesta al producer

curl --location 'localhost:10001/nsis/scntt/publish/new' \

--header 'Content-Type: application/json'
--data ' {

"licensePlate": "EFGH",
"latitude": "999",
"longitude": "-45454"

}

APRIRE ZIPKIN dovrebbe essere presente il trace della richiesta

curl -XGET 'localhost:9200/_cat/indices?v&pretty'

su elastick search dovrebbe esserci l'indice zipkin

ES indice : yellow open zipkin:span-2023-12-07 r-_GAXmuQLyvKsWu6knI-Q 5 1 34988 0 16.9mb 16.9mb

su kibana creare un index pattern zipkin* come campo timestamp , usare ‘timestamp_millis’

dopo aver creato index pattern su kibana, aprire Discover tab e dovrebbero esserci le informazioni collezionate da Zipkin.

creare le metriche

Average service duration

Using an average aggregation of the ‘duration’ field, you can create some metric visualizations that give you the average time for your services. Use a query to build the visualization # on a specific service

Average duration per service over time

Creare una dashboard con le metriche create

Link to view Swagger-ui

• http://localhost:10001/swagger-ui/index.html